Surveying and cruising instrument.



BEST AVAILABLE COPY J.. BARBOW. Q SVUBVBYING AND GRUISING INSTRUMENT.

nmoxnon Hum oo'r. ua nos.

' Patented June 13,1911.

50 dulum 13.

I line 'si hted to the one-quarter ost would give t e second graduationlan so on, as will be clearly understood by those skilled in the art towhich the invention appertains. The first graduation onthe scale 10b toone side of the north corner d indicates an angle of 14 2'; the secondniark Jindicates an angle of 26 34X; the third indicates an angle of 3652; the fourth indicates an 10 angle of 45";,the-fifthy indicates 53 8';the

sixth indicates an angle of 63" 26'; the seventh indicates an angle of75 58 while .the eighth indicates an angle of 90. -The pocket 11 ofthebox 1 has its bottom cov- 15,Y ered by s, scale plate 25 havinglines25a-25" running at right angles to one another and known 8S the duenorth and south and due east and west lines, which, when the instrumentis held with the com ass needle pointing to the NZ or nort mark, runrespectivel due north and south, and east and West. T e lines E-25b arethe fixed north and south andeast and west sighting lines of theinstrument and arf` used as guides in 22a-sighting with the instrument.The scale plate 25 is also suitably graduated at 1FL-1t) and 20 tocoperatc with the weighted indicator 13, but as Such cooperative partstoi'in the specific.subject-matter of" my original l. lication, adetailed description thereof is t ought to he unnecessary in thisapplication.

On a in 12 projected through the bottom of the 0x and concentric withthe scales 10P-'1018-1f), is a pendulum lil havin, r a pair offorkedbearing members 13a-13" to receive the pin 12, such bearing membersbeing formed at one end of the. pendulum 13' While a weight `13e isprovided at the 40 other Iend thereof to ride in a groove 17 cut intothe seat 9 beneath the scale plate l0. The pendulum 13 also has an eye3c and an I indicating pointer lil, the pointer 13d cri operatingwiththe scales )F5-19). `Above the bearing ends 13h-13" a compass. needle 1ohas a bearing 15 mounted on the pin 12,' While a needle lifter it hasits eye 14 pierced by the pin l2 and held vhetween forked bearing eye:`lith-til" of the pen- The lifter it is a level' ful- 4crumed at. I4."and engaged hy the head 24* of a pin 24 that is held to he engaged b thelid 2 when closed to litt. the needle 16 oli the pin 12 and hold ifagainst 'the glass cover plate 26 that is held ovc the pocket 11 of vtherbox 1 Aby a spring locking wire 26a as clearly shown in Figs and 4.of the drawings.

The instrument may he earriedahout by a non-elastic cord 23 secured toeyes 22.

It is to be noted 'that the east and ovest marks 10c Fig. 1, of thedrawings, te reversed on the scale 10 from the usual iosition theyvassume on scales oi' this type. Ihe numbers land letters on the scaleplate 25 are individually reversed to read correctly in the mirror 4.

By providing the pendulumvl with bearings 13-13" to straddle the needlelifter 14 the Weight: of the pendulum 13 will always serve to force theneedle lifter Madowndue allowance for the variation between themagneticand geographic meridians atthat place, I may provide` the scale 10 withslots 30, through which the screws vBlf-pass, and by loosening up thescrews 31,. the scalel() may be turned the required distance to makeit.' accord with the locality in which the instrument is to be used, thescale being again held from turning by tightening the screws 31. One ormore stets 30 and screws 31 .may be provided, :is desired, .three beingshown in Fig. 1, or a single screw and slot may be used, as shown inFig. 6, and a late 32 may be provided to prevent the sca e 10 fromrising u The changing of the graduated scale to allow for the variationsbetween theV magnetic and geographic meridians is commonly known in thcart as practiced in lumber regions as turning oil` the variations handwhen that expression is used in this application I desire it to he giventhe meaning stated.

If. desired 4a vernici' 533 as shown in Fig. 5 n'iay be attached to thehox to coperate with the scale l0 so that a more accurate 'i adjustmentof the scale 10 can be made, the Vernier heineof any approvedconstruction and used in the usual manner.

the general operation ot the instrument will he readily understood bythose skilled i' in the art, but T might mention that it desired the hoxand lid n1ay he swung with their adjacent faces into a coincidentplan,as shown in Fig. 1, and sighting tatie place across the faces ot' theliox and lid, or it may he advisable to provide the lid with a slot 34across which the inirror glass is left unsilvered and to'provide a line34. on the lid which when the lid and the hox of the instrument. arelying parallel, as shown in Figi. 1, will form. as it were. acontinuation ofthe north and south line 25" andwill pass through thecentral longitudinal plane of the slot 31- so that when ii horizontallyand the lid 2 tilted upward-ty. so that the operator can sight acrossthe upper edge of the lid and hy causingr the reflections of the line 25in thc mirror -t to .coincide with the line 24H the operator is desiredthe compass box 1 may he held nsevin connection with '20 andV minutes, asecond scaleplate carriedby` 'sensei a raclt portion on-its undersurface olcoperate with a pinion 36 on. a shaft' Tthat carriesa milledthumb nut 38, so 'that the scale l() may he turned in its own lane to`turn ofi variations without removingthe protecting glass 26, ifdesired. The

. l friction between the' shaft 37 and the Alion l is suiieient to holdthe scale plate l() in its adjusted positions. l

My invention is particulasly designed for a booklet published 'by me in909,`known as Barhowa Bookletn Tree Scale and Section Diagram,(copyrighted 1909)Whercin numerous tables are given for use inconnection with .my instrw ment whereby its use is largely facilitated.and'wherein `may be found the necessary data fon-correcting anyvariations in the direct readingof the scales, A, f

From the foregoing description taken in connection with the accompanyingdraivings, it is thought the complete construction, operation andadvantages of my invention lfrom the invention. What l claim is:

v 1 1. A surveying instrument that comprises a compass box, a compassneedle mounted in -said box, a scale plate cooperating with said.compass .needle and having the cardinal l n I l n points provided withlndlcatmg letters 5N-S-E and WW, said scale fplate having pointersgraduatedon the same .at the north, south, eastand West letterstoaccentuate .the indication of the north, south, east and West positions,a second scale plate carried by-said box beneath said compassV needle'and having graduated on the same a due north andsouth and a due east and1nest line, a lidv hinged to said box, a mirror can fied by said lid toreflect said compass 'needle and' said scales when said. lid'is tiltedupat an angle ton plane ofi/said box, said Having a line thereonaccording tothe north and south linh of said second scale plate.

A surveying instmment that includes va compassv looxya compass needlemounted in said boa, a saleuplate cooperating with said compass needleand ,graduated into degrees box beneath' said'compass needle vand havinggraduated on the same a due north .wand south, and east and Tweet line,a lid legami-su sani hom-'a rairroincamfied'by sald will be readilyunderstood by those skilled lid toreiiect said compass needle and saidscales when said lid is tilted up at an 'angle to the plane of said box,said lidhavi'ng a line thereon corresponding to the north and `southline of said second scale plate.

compass box, a compass needle mounted in said boxya scale platecooperating with said and minutes, a second scale plate carried by saidbox beneath salti-compass needle and and south line, a lid hinged tosaid boxra pass needle and said scales when said lid is .said lid havinga line graduated thereon corresponding to the north and south line k.ontsaid'second scale plate, said lid havinga slotcorrespondln'g to saidllne.

compass hon having a straight edge, a compass needle mounted in saidbox, a scale cooperating (with Tsaicl'compass needle, the box having alid hinged thereto, a mirror can ried lay for reflectingisaid scale andcompass needle, .said lid having a sighting portion alining With saidsighting slot, said lid also havinga line 'thereon allning with northand south line to cooperate with the -line'and slot ou. the lid.

5. A. surveying instrument consisting of a compassv box, a compassneedle mounted Within. Vsaid box and scale plates cooperating havingpalid, meansv movable loyfthe lid of said bois: .for operating said needlelifter tov engage said needle when the bozris'closed,

the compass needle engaging portion of said from engagement with saidcompass needle when the boxlid 1s open.

points provided .with indicating`- letters N -E LJS and W :respectivelyand having supplemental indica toi-,marks cooperating With'such letters,a compass needle mounted in said box to cooperate with said scale plata,a supplemental scale plate ing' fixed Toast and West and north and.south l lines, said lid 4having aysight- .inggslot to aline with Vsaidv north' and south lines, a .mirror carried by said lid to redect. saidscale plates and compass, and

means adjustably holding said scale to permit turning of saiddegreescale'late to adjust the same to allow furthe d1 erences slotand said mirror'having atransparent and a Weighted member cooperating with" needlelifter, to release said needle lifter' A. surveymg instrument thatincludes a compass .needle and graduated into degrees having graduatedon the same a duel north mirror carried by said lid to reflectsaid'comtilted up at an angle toathe plane of said box, a

4. A surveying instrument comprising a said slot, and said compass boxhavin a due loo' with said compass needle, a compassv needle. liftermounted Within said box, said box` 6. lIn an instrument ofthe characterstated, a boa having a lid, a degreefscale plate` mounted in said coxand-having cardinal mountedheneath said compass needle havl platecoperating therewith, saidp ate being graduated from 0 to 90o in eachquad-v rant, and said plate also having graduat-ions-l for mdicating thebounding corners of fa section of land.

8. In an instriiment of the character stated,

a compass' needleand'a degree scale pla-te cooperating therewith, saiddegree scale plate being graduated from 0 to 90 in each quadrantto forma degree scale, and said scale plate also hav-ing a second series ofmarke forming a supplemental scale cooperating with said compass needleand indicating the bounding corners of a section of land. l

9. In an instrument of the character stated, acompass needle and adegree scale plate coperating therewith, said plate being graduated from0 to 90 in each quadrant, said plaie having graduations for indicatingthe bounding corners ot' a section of land, and a hinged mirroreol'ierat'ing with the aforesaid parts.

l0. In an instrument of the character stated, a compass needle and adegree scale plate coperating therewith, said degree scale plate beinggraduated from 0 to 90 in each quadrant to form a degree scale, saidscale vplate having a second series of marks forming a supplementalscale coperating with said compass needle and'indieating the boundingcorners of a section of land, and a hinged mirror cooperating with theaforesaid parts.

11. In an instrument of the character stated, a compass needle and adegree scale stated, a degree scale plate having the eardinal pointsprovided with the indicating t N', 7 E v s 17 and j reversed tothe usualorder, a compass needle mounted to coperate with 4said scale plate, abox in which said scale'plate and needle 'are mounted, and a movablemirror carried -by said box to reflect said scale plate.

1 3. In an instrument of the, l character stated, a box havinga chamber,e degreel scale plate mounted 1n said chamber, a'comf pass needlemounted lin said chamber to c'ojoperate with' said' scale plate, a lidyhinged to said box, a mirror carried by said lid, said box having anorth and south graduated line and said lid having a corresponding linetraversing said mirror. f

14. In an instrument of the character stated, a boX having a chamber, apinprojecting into said chamber, a compass needle mounted on said pin, aneedle lifter for raising said compass needle olf of said pin, said boxhaving a lid, meanscontrolled by said lid for operating said needlelifter to lift said needle when said lid isclosed, land l means mountedon said pin for engaging said needle'liter to restore it to its initialposition to disengage the compass needle when said lid 'is open.

15. In. an statedfa box having 'a' chamber, aI degree scale platemountedl in vsaid chamber, said scale plate being of ring-like form, acompass needle mdountedY .in said chamber and n u q l Vdesignating duenorth and south, a l 1d hinged to said box, said lidliaving a mirror andhaving a line 'on the same corresponding to said north and south lines.

JOSEPH BARBoWf IVitnesses: l

J. T. -MCCANN J. L. WiGLa.

instrument of the, character-

